It may be carbon - in my .220 Ack. Swift barrels, I get this very quickly - albeit, primarily in the throat. Carbon can be very difficult to remove:...
About For those who don’t know me, my name is Randy “RG” Robinett, a.k.a. The Ballistic Idiot- an affectionate (I hope) moniker bestowed upon me by Benchrest shooting Pals many seasons ago. I liked the ‘handle’ and incorporated it into the name of m
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